Majoritarianism is a traditional political philosophy. It states that a majority (sometimes categorised by religion, language, social class, etc.) of the population has the right to make decisions that affect the society.

Majoritarianism should not be confused with the concept of a majoritarian electoral system, which is a simple electoral system that usually gives a majority of seats to the party with a plurality of votes. A parliament elected by this method may be called a majoritarian parliament (e.g., the Parliament of the United Kingdom and the Parliament of India).